.mode-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.mode-btn {
    padding: 1rem;
    border: 2px solid #E5E7EB;
    background: white;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-align: center;
}

.mode-btn .material-icons {
    font-size: 24px;
}

.mode-time {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--gray);
}

.mode-btn.active {
    background: linear-gradient(135deg, var(--primary-orange), var(--primary-purple));
    color: white;
    border-color: transparent;
}

.mode-btn.active .mode-time {
    color: rgba(255,255,255,0.8);
}

.timer-circle {
    position: relative;
    width: 280px;
    height: 280px;
    margin: 2rem auto;
}

.timer-circle svg {
    transform: rotate(-90deg);
}

.progress-ring-bg {
    stroke: #E5E7EB;
    fill: none;
    stroke-width: 10;
}

.progress-ring-progress {
    stroke: url(#gradient);
    fill: none;
    stroke-width: 10;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.3s ease;
}

.timer-display {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 4rem;
    font-weight: 800;
    color: var(--dark);
    font-variant-numeric: tabular-nums;
    font-family: 'Space Mono', 'Courier New', monospace;
}

.controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.control-btn {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.control-btn .material-icons {
    font-size: 32px;
}

.control-btn.play {
    background: linear-gradient(135deg, var(--primary-orange), var(--primary-purple));
    color: white;
}

.control-btn.reset {
    background: white;
    color: var(--dark);
}

.control-btn:hover {
    transform: scale(1.1);
}

.sessions {
    padding-top: 2rem;
    border-top: 2px solid #F3F4F6;
}

.sessions-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 1rem;
}

.sessions-header .material-icons {
    color: var(--primary-orange);
}

.session-dots {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #E5E7EB;
}

.dot.completed {
    background: linear-gradient(135deg, var(--primary-orange), var(--primary-purple));
}

@media (max-width: 768px) {
    .mode-selector {
        grid-template-columns: 1fr;
    }

    .timer-circle {
        width: 240px;
        height: 240px;
    }

    .timer-display {
        font-size: 3rem;
    }

    .control-btn {
        width: 56px;
        height: 56px;
    }

    .control-btn .material-icons {
        font-size: 28px;
    }
}